Hot-air furnace.



I @Vi/memes I. I

J. B. HUCKLE L E. RIENHART. HOT AIR VFURISTAE.l APPLIOATVION FILED JULY 19, 1913.

1,079,491, Patented Nov. 25, 1913.

2 SHEETS-SHEET l;

boLUMBxA PLANQUE/PH co.,wAsHlNaroN. D. c.

J.. B. BUCKLE da W. E. RI'ENHRT.

HOT AIR FURNAGE. APPLICATION FILED JULY 19, 191s.

Patented Nov. 25, 1918.

2 SHEETS-'SHEET 2.

me/wim @@.w'm t z a 'i COI-UMH'A PMNDURAPH co., WASHINGTON. D. C;

imirnn sfrnrns PATENT onirica.

JAMES B. HUCKLE ANI) WLLIAM E. RIENI-IART, OF COLUMBUS, OHIO.

Hr-AIR FURNACE.

Specification of Letters Patent.

Patented Nov. 25, 1913.

Application filed July 19, 1913. Serial No. 779,941.

To all whom t may concern:

Be it known that we, JAMES B. HUGKLE and WILLIAM E. RIENHART, citizens fof the United States, residing at Columbus, inthe county of Franklin and State of Ohio, have invented certain new* and useful Improvements in Hot-Air Furnaces, of which the following is a specification.

Our invention relates to hot air furnaces and aims to provide a structure particularly adaptable for use in connection with gas although not necessarily so.

In the embodiment of our invention we aim to provide a novel structure in the peculiar location of the burner or fire boX and combustion chamber. We have placed the burner or iire'bo-X and combustion chamber in the upper portion of thefurnace casing, the purpose of this being two-fold: that of convenience in lighting, in that the burner will be in a more elevated position than usual and also in Vcausing the products of combustion to pursue a downward movement in their passage to the chimney. This downward movement is desirable in that the air to be heated is taken in adjacent the bottom of the furnace and is allowed vto pass upward, thereby always coming into contact with portions of the furnace, increasing in heat until it has reached the combustion chamber which is usually the hottest portion. We have also provided a novel arrangement o-f drums or radiators used by the products of combustion in transferring their heat to the incoming air.

The preferred embodiment of our invention is shown in the accompanying drawings, in which similar characters of reference designate corresponding parts, and in which:

Figure 1 is a central vertical section of our furnace structure, Fig. 2 is abottom plan view of the structure shown in Fig. 1, showing the outer casing removed, and, Fig. 3 is a section taken on line 3 3 of Fig. 1 and looking in the direction of the arrows.V

` In carrying out our invention, we have provided the usual type of casing 1 having an air inlet pipe 2 adjacentthe base and hot air outlet pipes 3 adjacent the top portion. It will also be noted that thetop wall 4 of this casing is formed of sheetv metal rolled to cone shape, the apeXof which is centrally disposed with relation to the` casing. The purpose of this will be referred to hereinafter.

Within the casing and near the upper portion thereof, we have provided a combustion chamber 5 of peculiar construction to accommodate any preferred type of gas burner 6. This combustion chamber is comprised of an inner circular wall 7 having an open top and an outer circular wall 8 having its top closed by an upwardly eX- tending cone-shapedwall 9, the apex of this latter cone being in vertical alinement with the apeX of the cone 4f. Leading downwardly from the combustion chamber 5, we have provided a number of pipe sections 10, these pipe sections converging toward each other and communicating with a drum 11 located beneath the level of the combustion chamber and adjacent the base portion of the casing. It will be noted that these pipe sections enter the drum at approximately a central point, thereby permitting the product-sof combustion to flow outwardly throughout its internal volume. vThis lower drum 11 is'also provided with a plurality of short pipe sections 12 disposed in circular array and being designed to permit the free upward passage of cold air entering through the pipe 2. From the lower drum 11, the products of combustion pass upwardly through conduits 13 disposed concentrically with the pipe sections 12, but along the periphery of the drum. It will be noted that the side walls of the drum 11 are somewhat inclined to give a slight upward direction to the products of combustion and to prevent the creation of dead air spaces. After leaving the conduits 13, these products enter a superposed angular drum 14; having its inner wall 15 inclined for a purpose similar to that outlined for the lower drum. This superposed drum 14; is also provided with a plurality of short pipe sections 16 passing entirely therethrough to also permit the passage of cold air. It will be noted that this superposed drum is slightly larger than the lowerA drum, whereby the air entering through the short pipe sections 12 in the lower drum passes upwardly and impinges on the pipe sections 10 leading from the combustion chamber, while the pipe sections 16 in the upper drum permits the passage of air not before heated. The entire structure is supported from :air spaces or Vthe peculia cone construction heretofore devan annular lliange member 17 rigidly carried by the side kof the casing, the horizontal leg of this Harige member supporting the superposed drum 14E which in turn supports the remaining structure.

' F rom the description thus far given, it

will beapparent that the-products of com-V bustion from the burner@ enter the combustion chamber 5 and are carried downwardly from this point, entering the lower drum l1 at, approximately a Vcentral point. From here they spread over the surface of the drum and again pass upwardly through the conduits 13 into the upper drum 1li. ln

' the meantime, cold air enters through the pipe 2 and'becomes heated by contact with Vthe walls of the lower drum and in its passage through the pipe sections 12, where it comes in contact with the heated pipes 10'and Athe combustion chamber itself. A ,portion of the incoming air is also caused to engage the walls of the upper drum and passes upwardly through the Vpipe sections 16, becoming heated during its entire passage. lt will be noted that as the air rises, it continually comes in contact with surfaces warmer than itself and consequently a maximum amount ofV heat will beextracted from the productsof combustion. Finally, this heated lair is allowed to collect in the upper portion of the chamber and to avoid dead pockets, we have'resorted to scribed... The cone shaped upper portion of the combustion chamber gives a coniining spacefor the products of combustion, as well asincreasing the amount of radiating surface of the chamber itself. The two i cones 4 and 9 are brought adjacent each other to deflect the heated air toward the outer portion of the casing, from where it is drawn off through the outlet pipes 3. The upper drum 14 is also provided with a Vpipe 18 connected thereto in any kdesired This may be accomplished by the interposition of short pipe sections 19 having a damper 20 therein and connecting the main outlet pipe 18 and the combustion chamber 5 as indicated in Fig. 1.

It will be noted that we have shown only three pipe sections 10, it being deemed suiiicient for the purposes of illustrating our invention to show only this number, although it is to be understood that any desired number may be used that may be convenient,

Vespecially as regards the lire box door, etc.

What we claim, is:

1. A hot air furnace comprising a casing, a combustion chamber in the top of said casing, pipes leading downward from the top of said chamber, a drum below the level of the bottom of said combustion chamber, said pipes converging toward each other and entering said druin at approximately its center, a second drum above said iii-st drum, conduits connecting said drums, an outlet pipe connected to said second drum, and means for introducing air to be heated beneath said first drinn.

2. A hot air furnace connnising a casing, an inwardly extending cone forming the top of said casing, a combustion chamber in the top of said casing, an upwardly extending cone forming the top of said chamber and lying directly beneath said casing top, pipes leading downward from the top of saidcasing, a drum below the level of the bottom of said combustion chamber, said pipes coni/erging toward each other and entering said drum at approximately its center, short pipe sections extending through said drum to permit the free passage of air, a second drum above said first drum, conduits from the periphery of said first drinn leading to said second drum, short pipe sections extending through said second drum to permit the free passage of air, an out-let pipe connected to said second drum, and means for introducing air beneath said lirst drinn.

In testimony whereof we aiiix oui' signatures in presence of two witnesses.

JAMES BQHUCKLE. VILLIAM E. RENHART. Witnesses:

lVAL'rnR E. L. BooK, A. PHELPS.

Copies of this patent may be obtained for' ve'cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

